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A351972 as a simple table

na(n)
01
12
23
36
411
521
640
778
8151
9294
10572
111115
122172
134234
148252
1516088
1631361
1761140
18119191
19232370
20453010
21883167
221721768
233356675
246543988
2512757830
2624871992
2748489172
2894531974
29184294706
30359291464
31700456240
321365573493
332662252082
345190190005

[1,2,3,6,11,21,40,78,151,294,572,1115,2172,4234,
 8252,16088,31361,61140,119191,232370,453010,
 883167,1721768,3356675,6543988,12757830,24871992,
 48489172,94531974,184294706,359291464,700456240,
 1365573493,2662252082,5190190005]